Secure Digital card is versatile flash memory that is able to handle a large variety of content, and most importantly prevents against accidental data loss. This card also features a built-in write protect switch that further ensures the safety of your data. SD card is for use in mobile phones, PDAs and palmtops, digital cameras and camcorders, audio players, and digital voice recorders. The 4GB SDHC Class 6 card is 150X.